| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 45°F | 69°F | 56°F | 2.1" |
| February | 44°F | 68°F | 56°F | 1.9" |
| March | 46°F | 70°F | 57°F | 1.4" |
| April | 48°F | 71°F | 59°F | 0.7" |
| May | 52°F | 72°F | 61°F | 0.2" |
| June | 57°F | 74°F | 65°F | 0.0" |
| July | 60°F | 78°F | 68°F | 0.1" |
| August | 60°F | 78°F | 68°F | 0.0" |
| September | 59°F | 80°F | 68°F | 0.1" |
| October | 54°F | 78°F | 65°F | 0.4" |
| November | 48°F | 74°F | 60°F | 0.7" |
| December | 43°F | 68°F | 55°F | 2.0" |
| Index | Santa Rosa Valley | California | National |
| Air quality index | 46 | 55 | 42 |
| Pollution index | 13,529,800 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 214 |
| Days with moderate air quality | 142 |
| Days w/ poor A.Q. for sensitive groups | 9 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.150% |
| Benzene | 0.190% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.180% |
| Mercury | 0.070% |
| City | Population | Air Quality Index | National Avg. |
| Casa Conejo, CA | 3,184 | 46 | 8.0% |
| Thousand Oaks, CA | 127,648 | 46 | 8.0% |
| Santa Paula, CA | 30,297 | 46 | 8.0% |
| El Rio, CA | 6,506 | 46 | 8.0% |
| Westlake Village, CA | 8,203 | 46 | 8.0% |
| Santa Rosa Valley, CA | 2,721 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Crest, CA | 2,721 | 64 | 28.0% |
| Brush Prairie, WA | 2,721 | 38 | 24.0% |
| Raoul, GA | 2,720 | 37 | 26.0% |
| Wentworth, NC | 2,720 | 43 | 14.0% |
| Zion, PA | 2,720 | 44 | 12.0% |
| Santa Rosa Valley, CA | 2,721 | 46 | 8.0% |
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